LT-4100 User & Installation Manual Rev 1.00 Bridge Alert Management (BAM)
Lars Thrane A/S www.thrane.eu Page 80 of 129
Responsibility transfer
The BAM concept defines the Central Alert Management (CAM) system as equipment used for centralizing
management, handling and presentation of alerts on the bridge. A CAM system may be standalone or
combined with other equipment, for example in the case of an Integrated Navigation System (INS).
A CAM system connects to multiple alert sources (such as the LT-4100 system) in order to manage and
present their alerts on the CAM UI. An alert will thus be presented in the alert list of both the alert source
and the CAM system.
To reduce the number of high-priority audible alerts for one situation that requires attention, if the CAM
system has additional knowledge regarding an alert situation, which caused the LT-4100 system to raise an
alert, the CAM system may apply responsibility transfer and raising a new alert with, if practicable, a lower
priority.
NOTE: Alerts of priority caution are not audible and therefore cannot have their responsibility
transferred.
NOTE: The LT-4100 will reject the request for responsibility transfer if no HBT sentence (indicating
good status) has been received from the CAM system within the last 90 s.
The alert text and alert description of an alert is presented on the CAM system. For some alerts, additional
information must be presented in order to allow user acknowledgement of the alert. Responsibility transfer
is not allowed for such alerts as they can only be acknowledged at the alert source, where the additional
information is present.
Time synchronization
The LT-4100 system can supply the UTC time of alert state changes to the CAM system due to the built-in
GNSS receiver.
NOTE: If the alert state change occurs before the built-in GNSS receiver has obtained the UTC time
or in case of GNSS receiver malfunctioning, the LT-4100 system will not supply the UTC
time.
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